Cam lapping processing apparatus

ABSTRACT

A cam lamping processing apparatus for immediately responding for general purpose includes a supporter configured to rotatably support opposite end portions of a reference shaft and a processing shaft, an interworker configured to rotate the reference shaft and the processing shaft to be interoperable with each other, and a lapping processor configured to process a processed cam installed on the processing shaft by replicating a profile of a master cam installed on the interoperated reference shaft.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims the benefit of priority to Korean Patent Application No. 10-2014-0166426, filed on Nov. 26, 2014 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a cam lapping processing apparatus, and more particularly, to a cam lapping processing apparatus for immediately responding for general purpose because a lapping operation is possible by imitating a mater cam.

BACKGROUND

A plurality of cams is formed on a cam shaft used for an engine for a vehicle.

When a cam rotates, a structure that comes in contact with a cam and is moved toward a cam shaft axis or is moved away from the cam shaft axis reciprocates with a desired period and profile. In this case, an abrasion degree of a component that contacts the cam may be minimized only when a surface of the cam is smoothly polished like a mirror surface. Thus, conventionally, the cam surface on the cam shaft is lapping-processed.

FIG. 1 is a diagram illustrating a conventional lapping processing method. Conventionally, the cam surface of a processed cam 32 is lapped and processed by attaching a lapping paper 81 to a paper guide surface 82 and applying a force according to a cam profile while rotating a processing shaft 31.

However, according to the conventional lapping processing method, since manual manipulation is used, it is difficult to obtain excellent roughness of a processed surface. It is impractical to apply the method to a unique device, to to extend the method to multi-product specifications. Exposure to danger due to accident caused by a rotor is increased. It is difficult to perform immediate response at time when lapping-processing is required, thereby degrading productivity.

SUMMARY

The present disclosure has been made to solve the above-mentioned problems occurring in the prior art while advantages achieved by the prior art are maintained intact.

An aspect of the present disclosure provides a cam lapping processing apparatus for lapping a surface of a processed cam at a predetermined pressure using a brush by imitating a profile of a master cam.

According to an exemplary embodiment of the present disclosure, a cam lapping processing apparatus includes a supporter configured to rotatably support opposite end portions of a reference shaft and a processing shaft, an interworker configured to rotate the reference shaft and the processing shaft to be interoperable with each other, and a lapping processor configured to process a processed cam installed on the processing shaft by replicating a profile of a master cam installed on the interoperated reference shaft.

The supporter may include a first sidewall and a second sidewall configured to fix opposite ends of the reference shaft and processing shaft installed in parallel to each other, and a base configured to connect the two bases.

A pint hole may be formed at one side end of each of the reference shaft and the processing shaft, and the supporter may include a driving axis inserted into the pin hole so as to synchronize rotation displacements of the two shafts.

The other side end of each of the reference shaft and the processing shaft may be engaged and fixed by a centering that is moved backward and forward in an axis direction in the supporter.

The interworker may include a geared belt that winds geared pulleys respectively formed on the two driving axes.

The interworker may further include a motor connected to any one of the two driving axes to rotate the driving axis.

The lapping processor may include a roller 61 configured to move backward and forward with respect to the reference shaft according to a profile of the master cam 22 of the reference shaft and to rotate while being in contact with a surface of the master cam, and a brush configured to be interoperable with an operation of the roller of moving backward and forward with respect to the reference shaft according to the profile of the master cam and to lapping-process a surface of a processed cam while being in contact with a surface of the processed cam of the processing shaft 31.

The roller and the brush may be fixed to a bracket and an arm fixed thereto, respectively.

A position of the arm may be adjusted with respect to the bracket.

The brush rotates around a rotation axis positioned in parallel to a rotation axis of the processing shaft by a motor fixed to an arm.

The brush may reciprocate in parallel to an axis direction of the processing shaft while being rotated by a motor.

The brush may be installed on a rotor inserted into a ball screw installed in parallel to the processing shaft and move in an axis direction of the processing shaft as a ball screw is rotated.

The rotor may include a table installed on guides formed in parallel to each other in a longitudinal direction of a ball screw in parallel to the ball screw and moving along the guides.

The cam lapping processing apparatus may further include a cylinder installed on the rotor, and configured to approximate the roller and the brush toward the reference shaft and the processing shaft to move the roller 61 and the brush away from the reference shaft and the processing shaft.

The ball screw may be rotated or reverse rotated by a motor that is rotated or is reversely rotated within a predetermined angle to reciprocate the brush in parallel to an axis direction of the processing shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings.

FIG. 1 is a diagram illustrating a conventional lapping processing method.

FIG. 2 is a diagram illustrating a cam lapping processing apparatus according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Exemplary embodiments will now be described more fully with reference to the accompanying drawings.

FIG. 2 is a diagram illustrating a cam lapping processing apparatus according to an embodiment of the present disclosure.

The cam lapping processing apparatus according to an embodiment of the present disclosure includes a supporter for rotatably supporting opposite end portions of a reference shaft 21 and a processing shaft 31, an interworker for rotating the reference shaft 21 and the processing shaft 31 to be interoperable with each other, and a lapping processor for processing a processed cam 32 on the processing shaft by imitating a profile of a master cam 22 on the interoperated reference shaft.

The supporter includes a base 10 that is a plate formed as a bottom, and a first sidewall 11 and a second sidewall 12 that are respectively disposed on opposite ends of the base 10 in a direction perpendicular to the base 10.

The reference shaft 21 and the processing shaft 31 are disposed in parallel to each other between the first sidewall 11 and the second sidewall 12, one side end of each of the two shafts 21 and 31 is fixed by a driving axis, and the other side end is fixed to a centering 43.

The driving axis has a corresponding shape so as to be inserted into a pin hole formed in each of the two shafts 21 and 31. Thus, when two driving axes are inserted into pint holes of the two shafts 21 and 31 while displacements of corresponding shapes of the two driving axes are matched, if rotation displacements of the two driving axes are synchronized to each other, the two shafts are also synchronized to each other and rotated.

In addition, the centering 43 is moved in a longitudinal direction thereof and is engaged and fixed to the other side end of each of the reference shaft 21 and the processing shaft 31. Likewise, since the length of each shaft is adjustable by the centering 43, it is possible to fix shafts with various lengths to the supporter according to the present disclosure. Needless to say, the centering 43 accurately matches a rotation center of a shaft so as to prevent the shaft from rotating eccentrically.

As described above with regard to the interworker, the driving axes for fixing one side end of each of the two shafts 21 and 31 may be positioned in the same way by aligning angular positions of the two shafts 21 and 31. Thus, when the driving axis is simultaneously rotated, the two shafts 21 and 31 are rotated to be interoperated with each other while rotation displacements of the two shafts 21 and 31 are synchronized with each other.

To this end, according to the present disclosure, rotations of the two driving axes may be interoperable with each other by forming geared pulleys at the aforementioned two driving axes, respectively and winding a geared belt 42 around the two pulleys. The geared pulleys and the geared belt 42 do not slip on each other, which is advantageous for continuously maintaining a state in which the two shafts 21 and 31 are synchronized with each other.

Since the two driving axes are already configured to be interoperable with each other, when only one of the two driving axes is rotated, the remaining driving axis is rotated. Accordingly, the interworker according to the present disclosure is configured in such a way that a first motor 41 is installed and connected to any one of the two driving axes so as to rotate one driving axis.

Then the lapping processor includes a roller 61 that moves backward and forward with respect to the reference shaft 21 according to the profile of the master cam 22 of the reference shaft 21 and rotates while being in contact with a surface of the master cam 22, and a brush 62 that is interoperable with an operation of the roller 61 and lapping-processes a surface of the processed cam 32 of the processing shaft 31 while being in contact with the surface of the processed cam 32.

The cam and the brush 62 are fixed to an arm 58 and a bracket 57 that act as a rigid body, and the bracket 57 that straightly reciprocates and elevates along a slot formed in a rotor 53 upward and downward, which will be described below. The roller 61 and the brush 62 are fixed to the bracket 57 and the arm 58 fixed thereto, respectively.

A position of the arm 58 is capable of being adjusted with respect to the bracket 57. That is, as illustrated in the drawing, the bracket 57 and the arm 58 are connected via a hinge h and a virtual pressure adjuster 59 shaped like a screw is installed between the bracket 57 and the arm 58. In this regard, when the virtual pressure adjuster 59 is tightened, the arm 58 is moved toward the bracket 57 around the hinge h, and when the virtual pressure adjuster 59 is released, the arm 58 is spaced apart from the bracket 57 around the hinge h. Accordingly, according to adjustment of the virtual pressure adjuster 59, a position of the brush 62 with respect to the roller 61 may be adjusted, and thus a virtual pressure may be adjusted.

The brush 62 rotates around a rotation axis positioned in parallel to a rotation axis of the processing shaft 31 by a third motor 63 fixed to the arm 58. Separately from rotation of the processed cam 32, since the brush 62 polishes a surface of the processed cam 32 while rotating, the surface of the processed cam 32 is uniformly lapping-processed along a profile surface thereof.

The brush 62 is simultaneously rotated by the third motor 63 and simultaneously, lapping-processes while reciprocating in parallel to an axis direction of the processing shaft 31.

A reciprocating structure of the brush 62 will now be described. A ball screw 51 disposed in parallel to the shaft is rotatably installed on each of the first sidewall 11 and the second sidewall 12 and is rotated in a forward direction or a reverse direction by a second motor 52.

A guide 55 is formed on the base 10 in parallel to the ball screw 51. The rotor 53 is inserted into the ball screw 51, and a table 54 formed below the rotor 53 is moveably coupled in a longitudinal direction along the aforementioned guide 55. Thus, when the ball screw 51 is rotated, the rotor 53 is moved in a longitudinal direction of the ball screw 51, and the table guides the rotor 53 to be moved in the longitudinal direction of the ball screw 51 while preventing the rotor 53 from rotating together in a rotation direction of the ball screw 51.

Since the aforementioned bracket 57 is inserted into the slot formed in the rotor 53 upward and downward, the bracket 57 is moved together as the rotor 53 is moved backward and forward. Thus, when rotation and reverse rotation of the second motor 52 is repeated, the rotor 53 inserted into the ball screw 51 is also moved backward and forward, the brush 62 installed in the rotor 53 also reciprocates (refer to an arrow of FIG. 2).

A cylinder 56 that approximates the roller 61 and the brush 62 toward the shafts 21 and 31 or moves the roller 61 and the brush 62 away from the shafts 21 and 31 is installed on the rotor 53. Since a pressure is capable of being uniformly applied in a direction in which the shafts 21 and 31 descend during a processing process, lapping-processing may be performed under a uniform pressure.

According to this configuration, the brush 62 is moved along a surface of the processed cam 32 upward and downward by virtue of the structure of the roller 61, the bracket 57, the slot formed in the rotor 53 upward and downward, and the arm 58, polishes the surface of the processed cam 32 while being rotated by the third motor 63, and also polishes the surface of the processed cam 32 while reciprocating in a longitudinal direction of the shaft by virtue of the structure of the second motor 52, the ball screw 51, the rotor 53, and the table 54.

The cam lapping processing apparatus according to the present disclosure is operated in the order stated below.

First, driving axes are matched to and inserted into pin holes of two shafts 21 and 31 in a state in which a bracket 57 is elevated by a cylinder 56 to elevate a roller 61 and a brush 62, each of the shafts 21 and 31 are fixed by a centering 43, and then the bracket 57 is lowered back to the cylinder 56 such that the roller 61 and the brush 62 respectively come in contact with a surface of a master cam 22 and a surface of a processed cam 32.

In addition, a virtual pressure adjuster 59 is adjusted to adjust a virtual pressure of the brush 62.

Then when power is on, a first motor 41 is operated to simultaneously rotate cam shafts 21 and 32.

Then second and third motors 52 and 63 are rotated such that the brush 62 polishes the surface of the processed cam 32 to perform lapping processing.

The lapping operation may be performed for a period of time determined in a timer.

After the above processing, only the processing shaft 31 is replaced and an operation may be re-started in a state in which the roller and the brush are re-elevated by the cylinder 56.

According to the present disclosure, since a brush is interoperable along a profile of a master cam, lapping is performed on a cam surface of a processed cam at a predetermined pressure, thereby excellent processing result.

According to the present disclosure, even if any specification of cam is processed, lapping is performed by imitating a master cam, and thus equipment and application timing do not have to be considered.

The present disclosure is capable of responding to expensive dedicated equipment, thereby reducing manufacturing costs.

In addition, the present disclosure is not affected by specification and has rapid operation response, thereby enhancing operation efficiency and enhancing productivity.

In addition, the detailed advantages of the present disclosure have been described above.

While the present disclosure has been particularly shown and described with reference to exemplary embodiments and drawings thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit of the present disclosure as defined by the following claims. 

What is claimed is:
 1. A cam lapping processing apparatus comprising: a supporter configured to rotatably support opposite end portions of a reference shaft and a processing shaft; an interworker configured to rotate the reference shaft and the processing shaft to be interoperable with each other; and a lapping processor configured to process a processed cam installed on the processing shaft by replicating a profile of a master cam installed on the interoperated reference shaft.
 2. The cam lapping processing apparatus according to claim 1, wherein the supporter includes a first sidewall and a second sidewall configured to fix opposite ends of the reference shaft and processing shaft installed in parallel to each other, and a base configured to connect the first and second sidewalls.
 3. The cam lapping processing apparatus according to claim 1, wherein: a pint hole is formed at one side end of each of the reference shaft and the processing shaft; and the supporter includes a driving axis inserted into the pin hole so as to synchronize rotation displacements of the two shafts.
 4. The cam lapping processing apparatus according to claim 1, wherein the other side end of each of the reference shaft and the processing shaft is engaged and fixed by a centering that is moved backward and forward in an axis direction in the supporter.
 5. The cam lapping processing apparatus according to claim 3, wherein the interworker includes a geared belt that winds geared pulleys respectively formed on the two driving axes.
 6. The cam lapping processing apparatus according to claim 5, wherein the interworker further includes a motor connected to any one of the two driving axes to rotate the driving axis.
 7. The cam lapping processing apparatus according to claim 1, wherein the lapping processor includes: a roller configured to move backward and forward with respect to the reference shaft according to a profile of the master cam of the reference shaft and to rotate while being in contact with a surface of the master cam; and a brush configured to be interoperable with an operation of the roller of moving backward and forward with respect to the reference shaft according to the profile of the master cam and to lapping-process a surface of a processed cam while being in contact with a surface of the processed cam of the processing shaft.
 8. The cam lapping processing apparatus according to claim 7, wherein the roller and the brush are fixed to a bracket and an arm fixed thereto, respectively.
 9. The cam lapping processing apparatus according to claim 8, wherein a position of the arm is adjusted with respect to the bracket.
 10. The cam lapping processing apparatus according to claim 8, wherein the brush rotates around a rotation axis positioned in parallel to a rotation axis of the processing shaft by a motor fixed to an arm.
 11. The cam lapping processing apparatus according to claim 7, wherein the brush reciprocates in parallel to an axis direction of the processing shaft while being rotated by a motor.
 12. The cam lapping processing apparatus according to claim 11, wherein the brush is installed on a rotor inserted into a ball screw installed in parallel to the processing shaft and moves in an axis direction of the processing shaft as a ball screw is rotated.
 13. The cam lapping processing apparatus according to claim 12, wherein the rotor includes a table installed on guides formed in parallel to each other in a longitudinal direction of a ball screw in parallel to the ball screw and moving along the guides.
 14. The cam lapping processing apparatus according to claim 12, further comprising a cylinder installed on the rotor, and configured to approximate the roller and the brush toward a shaft and to move the roller and the brush away from the shafts.
 15. The cam lapping processing apparatus according to claim 12, wherein the ball screw is rotated or reverse rotated by a motor that is rotated or is reversely rotated within a predetermined angle to reciprocate the brush in parallel to an axis direction of the processing shaft. 